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Income Taxes-Income Tax Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Federal									$ 24,029	$ 20,984	$ 11,628
State and local									2,890	2,085	1,907
Deferred									(9,943)	(8,535)	(733)
Total income tax expense	$ 860	$ 4,713	$ 6,024	$ 5,379	$ 2,102	$ 4,396	$ 4,746	$ 3,290	$ 16,976	$ 14,534	$ 12,802

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.